Brake shoe



Patented Mar. 1, 1932 UNITED STATE-s ALBERT NELSON, 01jk CHICAGO, ILLINoIs, AssICfNonv To Tin; AMERICAN :inruil:` s'IIoE a FOUNDRY COMPANY, or WILMINGTON, DELAWARE, AWCORPCBATICN or DELA- WARE BRAKE snor;

Application mea rune 9, 1930. serial-No. 460,036.`

This invention relates to brake shoes and it has for its object broadly to reenforce and strengthen the shoe and to hold the parts of the body together in case of fracture.

Another object of the invention is to provide a strong and stiff reenforcing back which is embedded in the shoe at the back of the body and is constructed to make interlocking engagement with the body during the casting operation.

In the accompanying drawings I have illustrated the invention in a simple embodiment of a common cast iron car shoe and referring thereto Fig. 1 is a plan view of the back showing the outline of the body of the shoe in broken lines and omitting the lug strap andlug.

Fig. 2 is a longitudinal section view of the back and vlug strap on the line 2 2 of Fig. 1 showing the cast parts of the shoe in broken lines.

Figs. 3,' 4 and 5 are transverse sectional views of the back on the lines 3 3, 4-4 and 5 5 respectively of Fig. 1.

Figs. 6 and 7 are sectional views of theshoe on the lines 6 6 and 7 7 of Fig. 2.

Referring to the drawings, the back 8 is preferably made from a single strip of sheet metal by bending and shaping a suitable blank and it is curved to conform with the curvature of the back of a brake shoe. side edges of the back are recessed at 9 at the middle of the back to receive the legs of the lug strap 10 and the back is upset or dished outwardly at 11 adjacent these recesses to receive and accommodate the inturned ends 12 of these legs, Fig. 6. The edges of the back adjacent the recesses are bent upward slightly at 18 to merge with the edges of the upset or dished portions 11. The outer end portions 14 of the back are flat and are provided with openings 15 to permit the body metal to flow therethrough and form anchorages for the end and guide lugs. of the back are depressed at 16 between the at end portions and the upwardly bent portions 13. These depressions are comparatively narrow transversely of the back leaving a broad substantially fiat central portion 17 eX- tending longitudinally of the back from the The The side edges the Hat end portions ofthe back. Between back, -being intercepted partly by the openings 15 in the fiat end sections 14. Openings 19 are providedin the back being formed partly in the depressed portion 16 and partly in the flatl portion 17 and preferably made'y in the'form of slots extending lengthwise ofthe back. The body metal will run into the depressions 16 and into the openings 19 during the casting operation forming secure anchor` age for the body to the back. The depressions 16 are not of sulicient width to receive the openings y19 wholly within them but it is desirable that these openings should be lo-y cated fairly close to the side edges of the back and therefore they are located in those portions of the back where the depressed portions 16 merge into the flat portion 17, being partly formed in each and thereby providing an angular anchorage which is especially strong. The shape of the back is strong and substantial and the conformation gives it increased stifness so that it will withstand the shocks and jars, stresses and strains, vibration and other effects of actual service.

I have shown the invention embodied in a simple form of solid cast iron car shoe but it may be embodied in other kinds of shoes, including composite shoes, without departing from the invention; and I reserve the right to make any changes in the form, construction and arrangement of parts within the scope of the following claims.

I claim:

1. A brake shoe comprising a body, and a back embedded therein, said back consisting of a single strip of sheet metal having narrow depressions extending longitudinally of the back at each side edge thereof and spaced from the middle and from each end thereof, those portions of the back between the oppositely disposed de ressions being relatively wide and substantially fiat, and there being enclosed openings in the back located partly in said depressions and partly in the subelupset or dished portions 11 andy merging with i l stantially Hat portions between opposite depressions to receive the body metal which forms angular anchorage between the body proper and the body metal in the depressions to retain the body on the back.

2. A brake shoe back consistin of a single stripof sheet metal, the side e ges of said back at the middle portion thereof beingvre Y cessed and portions of the back transversely thereof and adjacent said recesses beingup set and adapted to receive the legs and in- Y turned ends of a lug strap,the side edge portions of the back spaced from the recesses-` and the ends of the back being depressed to form longitudinally extending narrow de` pressions `at and adjacent the side edges of `the back, there being enclosed 'openings in the back formed partly in said depressions and partlyin the portions of the back between oppositely disposed depressions, those .portionsof the back between yoppositely disposed depressions being substantially flat v and that portionv of the back between the upsets` being substantially flat and merging therewith and with the end portions of the back.V 1 Y Y j ALBERT NELSON. 

